Exhaust pipe attachment



May 3, 1949. w. c. CURPHY EXHAUST PIPE ATTACHMENT Filed March 5, 1945lll INvENToFe WILLIAM C.CURPH Patented May 3, 1949 UNITED STATES PATENTOFFICE EXHAUST PIPE ATTACHMENT William C. Cui-phy, Monteur, IowaApplication March 3, 1945, Serial No. 580,899

This invention relates generally to tractors and like vehicles and inparticular to an attachment for an upright exhaust pipe for the engineson such vehicles adapted to keep moisture from entering the exhaust pipewhen the vehicle is standing idle in the open.

Tractors now in general use for road construction and farm work usuallyhave their engines provided with upright exhaust pipes which protrudeupwardly through the engine hood a distance such that the exhaust gasesare carried away from the tractor operator. When these tractors are leftin the open with the top of the exhaust pipe left uncovered, rain, snowand the like enters the exhaust pipe and travels therethrough into theengine cylinders. As a result the cylinders, and valves operativelyassociated therewith, are apt to become rusted so as to reduce theirservice life. More important, however, is the fact that whenconsiderable moisture becomes entrapped in the cylinders, and the engineis then started, serious injury generally results to the crank shaft orpiston connecting rods. This occurs because of the relativenoncompressibility of the moisture and the resultant failure of thepiston to move to its normal upstroke position. Because of thiscondition the connecting rod and engine shaft are either bent or broken.

In order to prevent moisture from entering into the engine cylinder itis the usual practice to cover the upper end of the exhaust pipe withcanvas or an inverted tin can. However, this procedure is oftenneglected or forgotten by the tractor operator. As a result exhaust pipecover attachments have been provided which are operatively associatedwith the engine throttle or ignition system to automatically open theexhaust pipe when the throttle is open or the ignition system closed,and to automatically close the exhaust pipe when the engine is stopped.These devices, however, are generally complicated and are a source ofinconvenience in usual engine service work because of the time requiredfor their removal from and assembly with the exhaust pipe. Further it isapparent that the exhaust pipe can be opened on any accidental openingof the throttle or closing of the ignition system as frequently occursin the case of children playing on tractors standing idie on farms.

It is an object of this invention, therefore, to provide an improvedexhaust pipe cover attachment.

A further object of this invention is to pro- 2 Claims. (C1. 98-60) Ail)vide an attachment for theupright exhaust pipe of an engine which isconstructed without any movable parts and adapted to keep moisture fromentering the exhaust pipe when the engine is at a standstill. y

Yet another object of this invention is to provide an attachment forkeeping moisture from entering an upright exhaust pipe for an enginewhich is of a simple and inexpensive construction, positive andefficient Ain operation, capable of being quickly and easily installedand removed for engine-servicing purposes and which does not interferein any way with the operation of the engine.

A feature of this invention is found in the provision of a coverattachment for an upright exhaust pipe, comprising av tubular bodymember with a reduced exhaustinlet at one end positionable above theexhaust pipe and an exhaust outlet at its opposite end incoaxialalignment with the exhaust inlet. The'inlet is connected with the bodymember by a perforated ring member. Within the body member is a moisturedeilecting member extended across the proiected areas of the exhaustinlet and outlet and having a downwardly sloped upper surface to contactmoisture entering the body member through the exhaust outlet and todirect such moisture' to a position on the defiecting member fordropping onto the connecting ring. `The moisture on the Connecting ringis drained 4 through the perforations therein to the outside of theexhaust pipe.

Further objects. features and advantages of this invention will becomevapparent from the following descrintionwhen taken in connection withthe accompanying drawings in which:

Fig. 1 is a fragmentary side view of the front portion of a tractorshowing one form of the attachment of this invention in assemblyrelation with an upright exhaust pipe for the tractor engine; V

Fig. 2 is a longitudinal sectional view through the attachment shown inFig. 1;

Fig. 3 is a sectional view taken along the line 3--3 in Fig. 2;

Fig. 4 is a sectionalnview on the line 4-4 in Fig. 2; I

Fig. 5 is a side elevational view of a modified form of the invention. i

Referring to the drawings there is illustrated in Fig. 1 the frontportion of a tractor having an engine it, an exhaust gas manifold l l,and an upright exhaust pipe i2 projected through the top of the engine`hood '13. --The exhaust pipe attachment of this invention is indicatedgenerally at I5 in assembly relation with the upper end IB of theexhaust pipe I2.

One form of the exhaust pipe attachment of this invention shown in Figs.2, 3 and 4, cornprises a lower straight tube member I'I having a slottedbottom end adapted to be positioned about the upper end I6 of theexhaust pipe I2. The tube I1 is secured to the exhaust pipe by a usualclamping strap I8.

An upper bent .tubei or casing` I9,'` of va circular shape in crosssection', has a central portion formed with a substantially 180 bend,with such bend terminating in straight end portions 2I and' 22 arrangedin coaxial alignment longitudinally of the tube I9. The top end 24 ofthe lower straight tube I'I is positioned in a concentricallyy spacedrelation within the lower end 2| of thebent tube I 9 (Figs. 1 and 2).This spaced relation is maintained by a perforated ring member- 23 whichis connected between the lower end of the bent tube;v I9-and4 the.4 topend 24y ofthe straight tube Il.`y It is seen, therefor-e, that the ends`2Il-y and 2'I of theftubesgITand I9, respectively, are inan overlappedrelation and with vthe end 2l in a spaced relation aboutlthe end 24.

The openings"inthe-fendsI 2'If and-220iv the bent tube-Igffare`ofialikev size and by' virtuev of, such endsbeingincoaxialfalignmentthe` upper end 22fis .directlyabovefthelowerend?! so thatv their projected cross,-sectional areas. as indicatedb v the dot-dashvlinesfAin Figl 2. denea straight. cylinder; Thebend in.thefcentral portion of theA bent tube I 9 is--such that theinner wallZeithereof. extends substantially across the projectedareas ofthe1 ends2 Iyandg22f Since thetop end 2410i the-straightiubell isarranged ina-spaced relation Jwithin the bottom end- 2 I ,ofthe tube I9, the Yprojected cross sectionalgareasofthe tube I'I. in-,. dicated bythedot-dash-,linesBwin Fig. 2, liest within-the-projectedareas ofthe-endsfZI `and 22` ofthe bent tube I9 and' isecompletely interceptedby theinnerwall- 26r- InY-th-e operation-.of -the,attachn'ient shownvinVY Fig. 2zmoisture.:,enteringethe top .end,22.of the. bent tube -IS'mayceithericontact the Vouterwall 2l of thebent ,central section,drop` directly. through the open end 22fontoftheconneoting ring.23. orfall against theuppei-,downwardly .sloped portion 28 of the inner-wall.26,z depending upon ,the direction .in -which the-,moisture enters .theopen end 22,as .indicated .bythe-arrows in Fig. 2. The,Y a

moisturecontacting .,thewouter wall 21 is moved by. gravityalong `theinnersurface of this wallto theconnectingmingr3.. The moisture fallingon i. the-upper slopedportion .Z8-of theinner wall 26,. is movedbycgravityto .the innermost `surfacell) 1 of the inner4 wall.,26,`.which surface. is in a substantially ,verticalplane extendedthroughapart ofthe'connectingring 2.3,as ,clearlyfappears fromr a considerationof Figs. 2 and.

A part of the moisture directed to the surface. i

ZBma-y dropy therefrom onto that part of the connecting ring 23'whichisvertically belowthe, surface-29. whiletheremainingpart of the moisturemay follow the surface 29 and the lower slopedvv surface ,3| of theinnerwall to the connecting ring. All ofthe water'falling or draining tothe connectingY ring is. drained through the perforations therein totheoutside vof fthef lower straight tube I'I, and in turn to the outside ofthe exhaustpipe I2.- upper'slopedsurfacez-constitutes a moisturedeiiecting member extended across the projected cross-sectional `area ofthe exhaust pipe I2.for directing water to the outside of the exhaustpipe opening;v

Itis-seein therefore, that the F The attachment in no Way interfereswith the operation of the engine I0, the lower straight tube I'I servingas an exhaust gas inlet for the bent tube I9, and the open end 22constituting an exhaust gas outlet. Since the bent pipe I 9 has arelatively smooth curvature and is of a greater diameter than thediameter of the exhaust pipe I2 a free passage of exhaust gases takesplace through the attachment without the buildfup of any objectionableexhaustback pressures.

The modiiied form of the invention shown in Fig. 5 is similar in allrespects to that shown in Fig. 2 except that the bent pipe or casing I9ais formed of a plurality of independent pipe sectionsl 32; 33'and 34Welded together in an end-toend relation toaccomplish a substantially180 curvature in the pipe I9a while having the opposite-end openingsthereof in coaxial alignment. The assembly and operation of theattachment in-Fig. 5 is similar in 4all `respectstothe assembly andoperation of the attachmentiin Fig; 2,' so that stock materiaL and whichis entirely free of any` movable parts whereby a positive and eilicientoperation is assuredfat all times. Further, in servicing the engine I0.'it is usually necessary to remove the hood I3. This isvdone by liftingthe hood I 3upwardly over the upper end I6 of the exhaust pipe I2 asindicated atD in Fig. 1 for a lifted position of the hood. Since'theattachment of this invention is secured to the exhaust pipe I2 only bythe clamping member I8, it is readily removed from and assembledy withthe exhaust pipe as a unit so that thev attachment offers butlittle-inconvenience in engine Work.

Although the invention has' been described with respect to severalembodiments thereof it is to be-understood that it is notto be solimited since changes and modifications can be made therein which areywithin the full intended scope of this invention as defined by theappended claims.

I claim:

1. The combination with an upright exhaust pipe for an engine, of anattachment to keep moisture from entering the upper end of said exhaustpipe when the engine is not being operated, comprising a first uprighttube member having its lower end adapted to be secured to said exhaustpipe upper end, a second upright tube member of larger diameter thansaid first tube having its bottom end in an overlapping relation withthe top end of said first tube, means for connecting said 'bottom endand said top end in a concentrically spaced relation having drainopenings therein, with said second tube being formed with an arcuatebend therein such that its opposite endopenings areA in co-axialalignment and a wall portion at said bendy is extended across theprojected area of said rst tube, whereby moisture entering said secondtube through the upper end thereof `falls on the inner surface of saidwall portion for gravity flow thereon to a position above a portion ofsaid connecting` means, said second tube member being of substantiallythe same cross sectional areaA overitsf complete *length so as toprovide for an unrestricted flow of exhaust gases therethrough.

2. An attachment for an upright exhaust pipe of an engine adapted tokeep moisture from entering the upper end of the exhaust pipe,cornprising a tube member having opposite end openings in coaxialalignment, and a central portion of a substantially semi-circular shape,with the inner Wall of said central portion being extended across theprojected areas of said coaxially aligned end openings, said tube memberbeing of substantially the same cross sectional area over its entirelength to provide for an unrestricted flow of exhaust gasestherethrough, an exhaust inlet for said tube member adapted to bepositioned about said exhaust pipe upper end, and means supporting saidexhaust inlet in a spaced relation with said exhaust pipe upper end,with said supporting means having drain openings therein.

WILLIAM C. CURPHY.

REFERENCES CITED The following references are of record in the tile ofthis patent:

UNITED STATES PATENTS Number Name Date 1,626,002 Lobit Apr. 26, 19271,811,323 LeJay June 23, 1931 10 2,164,987 Cover July 4, 1939 2,350,102Fairbanks May 30, 1944 2,420,700 Curphy May 20, 1947 FOREIGN PATENTS 15Number Country Date 3,421 Great Britain 1914 5,358 Great Britain 18268,091 Great Britain 1910 12,857 Great Britain 1887 20 16,393 GreatBritain 1900 22,362 Great Britain 1912 290,955 Great Britain May 24,1928 338,779 Great Britain Nov. 27, 1930

